package com.lottery.common.config;

import com.lottery.common.result.Result;
import org.springframework.core.MethodParameter;
import org.springframework.http.MediaType;
import org.springframework.http.converter.HttpMessageConverter;
import org.springframework.http.server.ServerHttpRequest;
import org.springframework.http.server.ServerHttpResponse;
import org.springframework.web.bind.annotation.RestControllerAdvice;
import org.springframework.web.servlet.mvc.method.annotation.ResponseBodyAdvice;

@RestControllerAdvice(basePackages = "com.lottery.controller")
public class ResponseAdvice implements ResponseBodyAdvice<Object> {

    @Override
    public boolean supports(MethodParameter returnType, Class<? extends HttpMessageConverter<?>> converterType) {
        // 如果接口返回的类型本身就是Result那就没有必要进行额外的操作，返回false
        return !returnType.getParameterType().equals(Result.class);
    }

    @Override
    public Object beforeBodyWrite(Object body, MethodParameter returnType, MediaType selectedContentType,
                                Class<? extends HttpMessageConverter<?>> selectedConverterType,
                                ServerHttpRequest request, ServerHttpResponse response) {
        // String类型不能直接包装
        if (returnType.getGenericParameterType().equals(String.class)) {
            return Result.success(body).toString();
        }
        // 否则直接包装成Result返回
        return Result.success(body);
    }
} 